{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1440-1AD00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1440-1AD00","canonicalUrl":"https://aoctrl.com/siemens/3RH1440-1AD00","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1440-1AD00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, 3RH1440-1AD00, size S00, 4 NO instantaneous contacts, 10 A thermal current, screw and snap-on mounting, IP20 front.","salesMarkdown":"It is sized as S00, the smallest frame in the SIRIUS family, which means it occupies a 90 mm wide by 57.5 mm tall footprint on the DIN rail, with a depth of 72 mm from the mounting surface to the front of the housing. The contacts are rated for a thermal current of 10 A at 24 V, with switching capacities that derate with voltage: 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V. This makes it suitable for pilot-duty control of PLC inputs, relay coils, contactor coils, and indicator lamps within a control panel. Terminals accept solid conductors from 0.5 mm² up to 4 mm², with dual-wire capability at the smaller sizes — 2 × (0.5 to 1.5 mm²) and 2 × (0.75 to 2.5 mm²). This covers most control-circuit wiring gauges used in panel building. ## Electrical performance and environment Surge voltage withstand is 6 kV, giving adequate clearance for 400 V line-to-line systems. Shock resistance is specified at 10 g for 5 ms and 5 g for 10 ms, which covers most vibration environments in fixed industrial machinery. The auxiliary switch is field-expandable (product extension auxiliary switch: Yes), meaning additional contact blocks can be added to the side of this unit if the four NO contacts are insufficient for the control scheme. The part carries the SIRIUS brand and is designed for global use with approvals that typically include UL, CSA, and CE (verify specific certification markings on the nameplate for your jurisdiction).","metaTitle":"Siemens 3RH1440-1AD00 SIRIUS Auxiliary Contactor, 4 NO, S00,","metaDescription":"Siemens SIRIUS auxiliary contactor 3RH1440-1AD00, size S00, 4 NO instantaneous contacts, 10 A thermal current at 24 V, screw and snap-on DIN mounting, IP20 front, current productio","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"72 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Width":"90 mm","Height":"57.5 mm","at 50 Hz":"0.8 ... 1.1","at 60 Hz":"0.85 ... 1.1","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-55 ... +80 °C","Fastening Method":"screw and snap-on mounting","Shock Resistance":"10g / 5 ms and 5g / 10 ms","Delayed Switching":"0","Lagging Switching":"0","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","Size Of Contactor":"S00","Product Brand Name":"SIRIUS","Contact Reliability":"one incorrect switching operation of 100 million switching operations (17 V, 1 mA)","Degree Of Pollution":"3","Product Designation":"Auxiliary contactor","at 24 V rated value":"10 A","Of Contactor Typical":"5 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.27 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 50 Hz rated value":"42 V","at 500 V rated value":"2 A","at 60 Hz rated value":"42 V","at 690 V rated value":"1 A","Instantaneous Contact":"4","For Auxiliary Contacts":"0","Make-Before-Break Switching":"0","Substance Prohibitance (Date)":"07/01/2006","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"Yes","Surge Voltage Resistance Rated Value":"6 kV","operational current at AC-12 maximum":"10 A","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Touch Protection Against Electrical Shock":"finger-safe","with low demand rate according to SN 31920":"40 %","Of Auxiliary Contacts Instantaneous Contact":"0","apparent holding power of magnet coil at AC":"4.6 VA","apparent pick-up power of magnet coil at AC":"27 VA","with high demand rate according to SN 31920":"75 %","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"4","Type Of Voltage Of The Control Supply Voltage":"AC","Inductive Power Factor With Closing Power Of The Coil":"0.8","Identification Number And Letter For Switching Elements":"40 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","Inductive Power Factor With The Holding Power Of The Coil":"0.27","Of The Contactor With Added Auxiliary Switch Block Typical":"5 000 000","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=523478&mlfb=3RH1440-1AD00","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1440-1AD00/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings of 3RH1440-1AD00?","answer":"It provides four NO instantaneous contacts rated at 10 A thermal current at 24 V. Switching capacity derates with voltage: 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V. The contactor is size S00, mounts on DIN rail, and has an IP20 front face."},{"question":"What is the mounting footprint of 3RH1440-1AD00?","answer":"Width is 90 mm, height is 57.5 mm, and depth is 72 mm. It snaps onto a 35 mm DIN rail or can be screw-mounted. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward or backward."},{"question":"What wire sizes does 3RH1440-1AD00 accept?","answer":"Terminals accept solid conductors: 2 × (0.5 to 1.5 mm²), 2 × (0.75 to 2.5 mm²), and 2 × 4 mm². This covers typical control-circuit wiring gauges."},{"question":"What compliance documentation is available for 3RH1440-1AD00?","answer":"RoHS compliance is confirmed with a substance prohibition date of July 1, 2006. The part is a Siemens SIRIUS product designed for global markets; typical certifications include UL, CSA, and CE. Verify specific approval markings on the nameplate for your jurisdiction."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1440-1AD00","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RH1440-1AD00 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}